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- // SPDX-License-Identifier: GPL-2.0
- /*
- * ROHM BD9571MWV-M regulator driver
- *
- * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
- *
- * Based on the TPS65086 driver
- *
- * NOTE: VD09 is missing
- */
- #include <linux/module.h>
- #include <linux/of.h>
- #include <linux/platform_device.h>
- #include <linux/regulator/driver.h>
- #include <linux/mfd/bd9571mwv.h>
- struct bd9571mwv_reg {
- struct bd9571mwv *bd;
- /* DDR Backup Power */
- u8 bkup_mode_cnt_keepon; /* from "rohm,ddr-backup-power" */
- u8 bkup_mode_cnt_saved;
- bool bkup_mode_enabled;
- /* Power switch type */
- bool rstbmode_level;
- bool rstbmode_pulse;
- };
- enum bd9571mwv_regulators { VD09, VD18, VD25, VD33, DVFS };
- #define BD9571MWV_REG(_name, _of, _id, _ops, _vr, _vm, _nv, _min, _step, _lmin)\
- { \
- .name = _name, \
- .of_match = of_match_ptr(_of), \
- .regulators_node = "regulators", \
- .id = _id, \
- .ops = &_ops, \
- .n_voltages = _nv, \
- .type = REGULATOR_VOLTAGE, \
- .owner = THIS_MODULE, \
- .vsel_reg = _vr, \
- .vsel_mask = _vm, \
- .min_uV = _min, \
- .uV_step = _step, \
- .linear_min_sel = _lmin, \
- }
- static int bd9571mwv_avs_get_moni_state(struct regulator_dev *rdev)
- {
- unsigned int val;
- int ret;
- ret = regmap_read(rdev->regmap, BD9571MWV_AVS_SET_MONI, &val);
- if (ret != 0)
- return ret;
- return val & BD9571MWV_AVS_SET_MONI_MASK;
- }
- static int bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev *rdev,
- unsigned int sel)
- {
- int ret;
- ret = bd9571mwv_avs_get_moni_state(rdev);
- if (ret < 0)
- return ret;
- return regmap_write_bits(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret),
- rdev->desc->vsel_mask, sel);
- }
- static int bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev *rdev)
- {
- unsigned int val;
- int ret;
- ret = bd9571mwv_avs_get_moni_state(rdev);
- if (ret < 0)
- return ret;
- ret = regmap_read(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret), &val);
- if (ret != 0)
- return ret;
- val &= rdev->desc->vsel_mask;
- val >>= ffs(rdev->desc->vsel_mask) - 1;
- return val;
- }
- static int bd9571mwv_reg_set_voltage_sel_regmap(struct regulator_dev *rdev,
- unsigned int sel)
- {
- return regmap_write_bits(rdev->regmap, BD9571MWV_DVFS_SETVID,
- rdev->desc->vsel_mask, sel);
- }
- /* Operations permitted on AVS voltage regulator */
- static const struct regulator_ops avs_ops = {
- .set_voltage_sel = bd9571mwv_avs_set_voltage_sel_regmap,
- .map_voltage = regulator_map_voltage_linear,
- .get_voltage_sel = bd9571mwv_avs_get_voltage_sel_regmap,
- .list_voltage = regulator_list_voltage_linear,
- };
- /* Operations permitted on voltage regulators */
- static const struct regulator_ops reg_ops = {
- .set_voltage_sel = bd9571mwv_reg_set_voltage_sel_regmap,
- .map_voltage = regulator_map_voltage_linear,
- .get_voltage_sel = regulator_get_voltage_sel_regmap,
- .list_voltage = regulator_list_voltage_linear,
- };
- /* Operations permitted on voltage monitors */
- static const struct regulator_ops vid_ops = {
- .map_voltage = regulator_map_voltage_linear,
- .get_voltage_sel = regulator_get_voltage_sel_regmap,
- .list_voltage = regulator_list_voltage_linear,
- };
- static const struct regulator_desc regulators[] = {
- BD9571MWV_REG("VD09", "vd09", VD09, avs_ops, 0, 0x7f,
- 0x6f, 600000, 10000, 0x3c),
- BD9571MWV_REG("VD18", "vd18", VD18, vid_ops, BD9571MWV_VD18_VID, 0xf,
- 16, 1625000, 25000, 0),
- BD9571MWV_REG("VD25", "vd25", VD25, vid_ops, BD9571MWV_VD25_VID, 0xf,
- 16, 2150000, 50000, 0),
- BD9571MWV_REG("VD33", "vd33", VD33, vid_ops, BD9571MWV_VD33_VID, 0xf,
- 11, 2800000, 100000, 0),
- BD9571MWV_REG("DVFS", "dvfs", DVFS, reg_ops,
- BD9571MWV_DVFS_MONIVDAC, 0x7f,
- 0x6f, 600000, 10000, 0x3c),
- };
- #ifdef CONFIG_PM_SLEEP
- static int bd9571mwv_bkup_mode_read(struct bd9571mwv *bd, unsigned int *mode)
- {
- int ret;
- ret = regmap_read(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
- if (ret) {
- dev_err(bd->dev, "failed to read backup mode (%d)\n", ret);
- return ret;
- }
- return 0;
- }
- static int bd9571mwv_bkup_mode_write(struct bd9571mwv *bd, unsigned int mode)
- {
- int ret;
- ret = regmap_write(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
- if (ret) {
- dev_err(bd->dev, "failed to configure backup mode 0x%x (%d)\n",
- mode, ret);
- return ret;
- }
- return 0;
- }
- static ssize_t backup_mode_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
- return sprintf(buf, "%s\n", bdreg->bkup_mode_enabled ? "on" : "off");
- }
- static ssize_t backup_mode_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
- {
- struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
- unsigned int mode;
- int ret;
- if (!count)
- return 0;
- ret = kstrtobool(buf, &bdreg->bkup_mode_enabled);
- if (ret)
- return ret;
- if (!bdreg->rstbmode_level)
- return count;
- /*
- * Configure DDR Backup Mode, to change the role of the accessory power
- * switch from a power switch to a wake-up switch, or vice versa
- */
- ret = bd9571mwv_bkup_mode_read(bdreg->bd, &mode);
- if (ret)
- return ret;
- mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
- if (bdreg->bkup_mode_enabled)
- mode |= bdreg->bkup_mode_cnt_keepon;
- ret = bd9571mwv_bkup_mode_write(bdreg->bd, mode);
- if (ret)
- return ret;
- return count;
- }
- static DEVICE_ATTR_RW(backup_mode);
- static int bd9571mwv_suspend(struct device *dev)
- {
- struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
- unsigned int mode;
- int ret;
- if (!bdreg->bkup_mode_enabled)
- return 0;
- /* Save DDR Backup Mode */
- ret = bd9571mwv_bkup_mode_read(bdreg->bd, &mode);
- if (ret)
- return ret;
- bdreg->bkup_mode_cnt_saved = mode;
- if (!bdreg->rstbmode_pulse)
- return 0;
- /* Enable DDR Backup Mode */
- mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
- mode |= bdreg->bkup_mode_cnt_keepon;
- if (mode != bdreg->bkup_mode_cnt_saved)
- return bd9571mwv_bkup_mode_write(bdreg->bd, mode);
- return 0;
- }
- static int bd9571mwv_resume(struct device *dev)
- {
- struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
- if (!bdreg->bkup_mode_enabled)
- return 0;
- /* Restore DDR Backup Mode */
- return bd9571mwv_bkup_mode_write(bdreg->bd, bdreg->bkup_mode_cnt_saved);
- }
- static const struct dev_pm_ops bd9571mwv_pm = {
- SET_SYSTEM_SLEEP_PM_OPS(bd9571mwv_suspend, bd9571mwv_resume)
- };
- static int bd9571mwv_regulator_remove(struct platform_device *pdev)
- {
- device_remove_file(&pdev->dev, &dev_attr_backup_mode);
- return 0;
- }
- #define DEV_PM_OPS &bd9571mwv_pm
- #else
- #define DEV_PM_OPS NULL
- #define bd9571mwv_regulator_remove NULL
- #endif /* CONFIG_PM_SLEEP */
- static int bd9571mwv_regulator_probe(struct platform_device *pdev)
- {
- struct bd9571mwv *bd = dev_get_drvdata(pdev->dev.parent);
- struct regulator_config config = { };
- struct bd9571mwv_reg *bdreg;
- struct regulator_dev *rdev;
- unsigned int val;
- int i;
- bdreg = devm_kzalloc(&pdev->dev, sizeof(*bdreg), GFP_KERNEL);
- if (!bdreg)
- return -ENOMEM;
- bdreg->bd = bd;
- platform_set_drvdata(pdev, bdreg);
- config.dev = &pdev->dev;
- config.dev->of_node = bd->dev->of_node;
- config.driver_data = bd;
- config.regmap = bd->regmap;
- for (i = 0; i < ARRAY_SIZE(regulators); i++) {
- rdev = devm_regulator_register(&pdev->dev, ®ulators[i],
- &config);
- if (IS_ERR(rdev)) {
- dev_err(bd->dev, "failed to register %s regulator\n",
- pdev->name);
- return PTR_ERR(rdev);
- }
- }
- val = 0;
- of_property_read_u32(bd->dev->of_node, "rohm,ddr-backup-power", &val);
- if (val & ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK) {
- dev_err(bd->dev, "invalid %s mode %u\n",
- "rohm,ddr-backup-power", val);
- return -EINVAL;
- }
- bdreg->bkup_mode_cnt_keepon = val;
- bdreg->rstbmode_level = of_property_read_bool(bd->dev->of_node,
- "rohm,rstbmode-level");
- bdreg->rstbmode_pulse = of_property_read_bool(bd->dev->of_node,
- "rohm,rstbmode-pulse");
- if (bdreg->rstbmode_level && bdreg->rstbmode_pulse) {
- dev_err(bd->dev, "only one rohm,rstbmode-* may be specified");
- return -EINVAL;
- }
- #ifdef CONFIG_PM_SLEEP
- if (bdreg->bkup_mode_cnt_keepon) {
- int ret;
- /*
- * Backup mode is enabled by default in pulse mode, but needs
- * explicit user setup in level mode.
- */
- bdreg->bkup_mode_enabled = bdreg->rstbmode_pulse;
- ret = device_create_file(&pdev->dev, &dev_attr_backup_mode);
- if (ret)
- return ret;
- }
- #endif /* CONFIG_PM_SLEEP */
- return 0;
- }
- static const struct platform_device_id bd9571mwv_regulator_id_table[] = {
- { "bd9571mwv-regulator", },
- { /* sentinel */ }
- };
- MODULE_DEVICE_TABLE(platform, bd9571mwv_regulator_id_table);
- static struct platform_driver bd9571mwv_regulator_driver = {
- .driver = {
- .name = "bd9571mwv-regulator",
- .pm = DEV_PM_OPS,
- },
- .probe = bd9571mwv_regulator_probe,
- .remove = bd9571mwv_regulator_remove,
- .id_table = bd9571mwv_regulator_id_table,
- };
- module_platform_driver(bd9571mwv_regulator_driver);
- MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
- MODULE_DESCRIPTION("BD9571MWV Regulator driver");
- MODULE_LICENSE("GPL v2");
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